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[Ventricular tachyarrhythmia. Drug therapy and evaluation of success]
1Abteilung Innere Medizin III, Medizinische Universitätsklinik Tübingen.
Insights
Antiarrhythmic drugs effectively treat ventricular tachyarrhythmias. While Holter monitoring and electrophysiological testing aid efficacy prediction, their definitive value remains under investigation for optimal antiarrhythmic therapy control.
Area of Science:
- Cardiology
- Pharmacology
Context:
- Ventricular tachyarrhythmias require effective antiarrhythmic drug therapy.
- Clinical tools like Holter monitoring and electrophysiological testing are used to assess drug efficacy and proarrhythmic effects.
Purpose:
- To evaluate the predictive value of Holter monitoring and programmed ventricular stimulation in assessing antiarrhythmic drug efficacy for ventricular tachyarrhythmias.
- To determine the optimal method for controlling antiarrhythmic therapy.
Summary:
- Both Holter monitoring and programmed ventricular stimulation can predict the efficacy of antiarrhythmic drugs (classes 1-3) and calcium channel blockers (class 4) in treating ventricular tachyarrhythmias.
- Holter monitoring may offer higher efficacy prediction, while electrophysiological testing provides higher sensitivity with fewer false positives.
- Recent studies challenge the established value of both methods, leaving the optimal control of antiarrhythmic therapy uncertain.
Impact:
- Provides insights into the current methodologies for assessing antiarrhythmic drug effectiveness.
- Highlights the ongoing debate and need for further research in optimizing antiarrhythmic therapy management.
- Informs clinicians about the predictive capabilities and limitations of diagnostic tools in managing ventricular tachyarrhythmias.
Abstract:
In principle, all antiarrhythmic drugs (classes 1-3) are useful in the treatment of ventricular tachyarrhythmias. In special cases even Ca-antagonists (class 4) can be effective. Holter monitoring and programmed ventricular stimulation are clinical tools for predicting efficacy and controlling proarrhythmic effects. However, only in a limited number of patients are the prerequisites given for testing with one or the other method. Using long-term tape recording the suppression of ventricular salvoes by an antiarrhythmic drug seems to predict a good prognosis. In the electrophysiological lab complete or partial suppression of inducibility of the arrhythmias during programmed stimulation under antiarrhythmic treatment has a high predictive value as far as recurrence during follow-up is concerned. Using Holter criteria the efficacy of antiarrhythmic drugs is higher than with programmed stimulation. However, invasive electrophysiological testing has a higher sensitivity, i.e., a low rate of false-positive results. As the results of two newer studies question the value of both methods, a definitive answer of the problem of optimal control of antiarrhythmic therapy cannot be given today.